Photomultiplier assembly having universal alignment means

A photomultiplier assembly including:

• a tubular member of high magnetic permeability,
• a photomultiplier tube disposed within said tubular member, said photomultiplier tube having an input faceplate and a stem located opposite therefrom, said stem having a plurality of leads extending therefrom, said leads extending through a lead spacing base, said photomultiplier tube having encapsulated voltage distribution means attached thereto,
• an annular spacer disposed adjacent to said faceplate,
• a universal member extending longitudinally along at least a portion of said photomultiplier tube, said universal member and said annular spacer providing a slip-fit between said photomultiplier tube and said tubular member spacing said photomultiplier tube from said tubular member, said universal member having an inside surface and an outside surface, said inside surface having a retaining shoulder which projects radially inward therefrom and extends between said lead spacing base and said stem, said outside surface having a plurality of recesses therein, and
• a plurality of locking members, each locking member having a first end formed to fit flushly with one of said recesses of said universal member, said first end being retained between said universal member and said tubular member, said locking members having a second end fixedly attached to said tubular member.